Prepositional Phrases

There's a joke that gets passed round every English classroom sooner or later: The man walked the dog in a yellow jumper. Who's wearing the jumper — the man, or the dog? You can picture it either way, and that's exactly the problem. One small bundle of words — in a yellow jumper — has landed in the wrong spot, and the whole sentence goes wobbly.

That bundle has a name: a prepositional phrase. You already use dozens every day without a second thought — "I'll meet you after school," "The cat's under the table." You're not learning something new so much as learning to see something you already do. Once you can spot the pattern, you'll notice when it's gone wrong, in your own work or someone else's. Nobody's born knowing this. So let's build it up: what these phrases are made of, what job they do, and where they like to sit.

The basic shape

A preposition is a small word that shows a relationship — usually place, time, direction, or manner: in, on, under, at, by, with, from, to, after, before, during, between, behind, near.

On its own, a preposition doesn't say much. "Under" — under what? The answer arrives when you give it an object: a noun, or a whole noun phrase. So the structure is:

preposition + object (usually a noun or noun phrase)

• "The dog is under the table." → under + the table
• "We sat in the garden." → in + the garden
• "I'll see you after lunch." → after + lunch

Put the two together and you get a chunk that behaves as one unit. Prepositional phrases typically answer one of three questions: Where? ("The ball rolled into the road"), When? ("We'll play after dinner"), or How? ("He spoke with confidence").

Watch out: not every to introduces a prepositional phrase. In "We walked to the park," to is a preposition and the park is its object. But in "I like to read," to is part of the infinitive verb — there's no prepositional phrase. If to is followed by a verb, it's almost never a preposition.

Two jobs: describing a noun, or an action

The same kind of phrase can do two quite different jobs, and knowing which tells you where it belongs.

Job one: describing a noun (adjectival). Sometimes a prepositional phrase describes a noun, the way an adjective would, answering which one?

• "The girl with the red hat waved." → which girl?
• "Have you seen the book on the desk?" → which book?

Notice where each phrase sits: right after the noun it's describing. Adjectival phrases are sticky — they cling to their noun. Move them away and the sentence stops making the sense you intended.

Job two: describing an action (adverbial). Other times the phrase describes a verb, telling you where, when, or how. This is an adverbial prepositional phrase.

• "She danced in the rain." → where?
• "We'll talk after the match." → when?
• "He worked with great care." → how?

Adverbial phrases are far more flexible about position. Both "After school, we went to the park" and "We went to the park after school" are fine — the front position just adds emphasis. Adjectival phrases don't get that freedom: "The painting on the wall is new" works, but "The painting is new on the wall" makes no sense.

So the working rule: if the phrase describes a thing, keep it glued to that thing. If it describes an action, you've got room to move it.

Pro-tip: if you're not sure which job a phrase is doing, try deleting it. If the sentence still makes sense but you've lost detail about which one, it was adjectival. If you've lost detail about when/where/how, it was adverbial.

Stacking, and the trap of ambiguity

You can chain several prepositional phrases in a row — English does it constantly: "We had a picnic in the park by the river under the old bridge." Each phrase narrows things down further. The risk is that the longer the chain, the easier it is for a phrase to attach to the wrong noun.

That's what causes the yellow-jumper problem. An ambiguous sentence is one that could honestly be read two ways:

• "I saw the man with the binoculars." → either you had the binoculars, or the man did.

Because with the binoculars sits right next to the man, English naturally attaches it there — the nearest noun tends to "win" the phrase. If that's not what you meant, you have to intervene:

• "With the binoculars, I saw the man." (Now it's clearly you.)
• "I saw the man who was in the corridor" is the same trick with a relative clause — it pins the phrase to the right noun.

The same drifting happens in a stack: "The boy near the window with brown hair is my friend" makes with brown hair look like it describes the window. Keep each phrase as close as you can to the word it belongs to.

Starting a sentence with a prepositional phrase is a genuine stylistic tool, especially in stories: "In the distance, a siren wailed." But don't pile on too many — "We went for a walk in the park after school with our friends from maths class on Tuesday before the holidays" buries the main action. Trim, reorder, or split.

Watch out: don't split a preposition from its object. "She sat on quietly the chair" is wrong — the preposition and its object are a package deal. "She sat quietly on the chair" keeps them together. (This is a small taste of a bigger topic, misplaced modifiers.)

Quick check

1. Underline the prepositional phrase and name the preposition: "After lunch, the class went outside."

2. Adjectival or adverbial? (a) "The boy with the glasses answered." (b) "She sang in the choir."

3. Rewrite so it's clear that you had the binoculars: "I saw the birdwatcher with the binoculars."

4. Add two prepositional phrases to: "The dog slept."

5. Which is clearer, and why? (a) "She spoke to the girl in the playground." (b) "In the playground, she spoke to the girl."

Where next

• — Noun Phrases —: for a refresher on how the objects of prepositions are built.
• — Prepositions: Place, Time and Direction — (UK and US editions): the word class itself, in more depth.
• — Adverbs and Adverbial Phrases — : how prepositional phrases fit into the wider adverbial picture.
• — Sentence Structure: Subjects, Verbs and Objects — : for context on where these phrases sit in a full sentence.
• Misplaced modifiers — the fuller technical treatment of ambiguity and placement, in the Sentences pillar.